package thread;

import java.util.ArrayList;

public class Test {
    public static void main(String[] args) {
        ArrayList<Integer> list=new ArrayList<>();
        Thread t1=new Thread(){
            public void run(){
                    for (int i = 0; i < 1000; i++) {
                        synchronized (list) {
                            list.add(i);
                        }
                    }
            }
        };
        Thread t2=new Thread(){
            public void run(){
                for (int i = 0; i < 1000; i++) {
                    synchronized (list) {
                        list.add(i);
                    }
                }
            }
        };
        t1.start();
        t2.start();
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(list.size());
    }
}


